Device for rotatable support of rolls comprising a web of cloth or similar

ABSTRACT

A device for the rotatable support of rolls of cloth or the like webs, which webs can be lowered from the device by the rotation of the roll to serve as a back ground screen, for example, in photographic studios and the web raised by rewinding the same to roll form on the device which is supported at an appropriate height when in use.

United States Patent [191 Lindeliiw [451- July 9,1974

[ DEVICE FOR ROTATABLE SUPPORT OF ROLLS COMPRISING A WEB OF CLOTH ORSIMILAR [76] Inventor: Bjiirn T. Lindeliiw, Korshamnsvagen 8384, 430 41Kullavik, Sweden 22 Filed: N0v.3, 1970 21 Appl. No.: 86,434

[30] Foreign Application Priority Data Nov. 5, 1969 Sweden 15136/69 [52]US. Cl. 160/120, 160/241 [51] Int. Cl. A47h l/00, 47g 5/02 [58] Field ofSearch 160/120, 241, 238, 242,

[5 6] References Cited UNITED STATES PATENTS 20,013 4/1858 Work..160/321 111,405 l/l87l V088 160/321 2,547,399 4/1951 Leveridge 242/662,954,823 10/1960 Davis 160/120 2,980,356 4/1961 Beese et 31.. 242/663,055,606 9/1962 Alden 242/66 3,311,160 3/1967 Barbour 160/242 4 PrimaryExaminerPeter M. Caun [57] ABSTRACT A device for the rotatable supportof rolls of cloth or the like webs, which webs can be lowered from thedevice by the rotation of the roll to serve as a back 'ground screen,for example, in photographic studios and the web raised by rewinding thesame to roll form on the device which is supported at an appropriateheight when in use.

2 Claims, 4 Drawing Figures PATENTEDJUL sum 22,733

sum 1 or 2 $24 FIG. 1

awn/T01; BJORN L/NDELOW AT'TORNEyS PATENTEDJUL 92974 Sam 2 0r 2 uwmronBJ R u vonow WM RTT RNEYS DEVICE FOR ROTATABLE SUPPORT OF ROLLSCOMPRISING A WEB OF CLOTH OR SIMILAR The present invention relates to adevice for rotatable support of rolls comprising a web of cloth orsimilar, which web by the rotation of the roll is unwound and loweredfrom the device, which is positioned at a suitable height level, saidweb thereby serving the purpose of a back ground screen by way ofexample in photographic studios, the device being arranged also forrewinding of the web to a roll form, and comprising two rotatablymounted and interspaced rollers, between which the web shall hang insuspension and the longitudinal axis of which are in a common horizontalplane in the intended working position.

When using roller screens as backgrounds in for example photographicstudios it is of great value, if the screens are rapidlyinterchangeable. Because of the fact that quite a number of screensgenerally must be available it is also desirable that each screen rollshall be as simple as possible, as light as possible and occupy aslittle space as possible. Said conditions are not fulfilled in rollerdevices for said purpose according to the prior art. Such known rollerdevices require for their proper functioning that the roll is providedwith a rotatable core, which means that in each mounting operasteps of90 by the arrangement of three holes 9 corretion the core must beconnected with the supporting means and be coupled to a rotation devicefor rewinding of the web. In order that the time required for changeshall not be further prolonged, it is in addition a common feature thatthe web material of the roll is fastened to its own core, which, when agreat number of rolls are involved, can mean a considerable investmentand also that the rolls are heavy and bulky. It is an'object of thepresent invention to eliminate these drawbacks by providing a device,which permits the roll simply to be placed into the same without thenecessity to engage any shafts, and moreover, if the web is made offairly stiff material, there is no need at all to have the roll providedwith any core structure.

The object of the invention is obtained by making the.

device in such a manner that the rollers alone suspend and guide thescreen roll and that they are coupled to a gear transmission enablingthem simultaneously and at the same speed to be driven from saidtransmission, the screen roll bearing against the rollers thereby beingrotated by friction.

An embodiment of the invention will now be described with reference tothe accompanying drawings, in which FIG. 1 illustrates a perspectiveview of the device carrying a screen roll, 1 v

FIG. 2 shows a view from the left of the device in FIG. 1, while FIG. 3is the device in FIG. 1 in a vertical cross sectional view at the rightend along the center axis, as seen from the inside, and

FIG. 4 is a front view of the device,the longtudinal extension of therollers being shortened by a portion having been cut off.

According to FIG. 1 the'device comprises two end portions 1 and 2, eachone comprising an angular support 3 and 4 respectively and a circulardisc 5 and 6 respectively, which can be rotated in relation to itssupport around its centre, it also being possible to fix said disc atthe support by means of a screw 7 and 8 respectively (see also FIG. 4)in three different positions in spondingly located in the discs 5 and 6(see also FIGS. 2 and 3). The supports 3 and 4 as shown in FIG. 1 areintended tobe fixed to a roof, but also to a wall, in the latter casethe supports being pivoted from the position illustrated in FIG. 1 inrelation to the discs 5 and 6 respectively by changing the screws 7 and8 to another one of the holes 9. The supports 3 and 4 can of course alsobe interconnected by an elongated bar, -not shown, which in its turn isfixed or suspended. The end portions 1 and 2 after the mounting shallexhibit a predetermined distance in between them, which is adjustedaccording to two rollers 10 and 11, which by means of pivot pins 12 and13 are pivotably suspended in bushings 14 of the discs 5 and 6. Thepivot pins 12 of the rollers 10, 11 at the disc 5 as shown in FIGS. 2and 4 are provided each one with identically shaped gears 15, whichengage a gear 16 concentrically journalled in the disc 5. The gear 16 ismounted on a shaft 17, which extends through the support 3 and at theoutside of said support carrying a pulley 18.

The rollers 10 and 11 according to FIG. 3 are suitably made of tubularmaterial provided with inserted end portions with pivot pins, and theyare suitably at least in part coated with or made of a frictionmaterial, by way of example, rubber. The discs 5 and 6 according to FIG.4 are pivotably mounted relative to the respective supports on the disc6 by means of a centric screw 19 and on the disc 5 by means of the shaft17 joumalled in said disc and the support 3. By spacers 20 and 21 aninterspace is obtained between the discs and the res'pective supports,in which the ends of the shafts, the gear transmission, etc., arereceived.

The pulley 18 is intended to receive an endless cord 22 (see FIG. 1)which is impeded from sliding off the pulley by means of pins 23 andwhich is kept in tension by means of a weight 24.

The screen roll 25, which'is going to be used together with the device,is made of fairly stiff material and is not equipped with any core, butat its free edge it is provided with a weighting bar 26. As is evidentfrom FIGS. 1 and 3 the screen roll is placed on the rollers 10 and 11with the portions 27 of the web, which shall be unwound, hanging downbetween the rollers.

When the device is going to be used, a screen roll 25 of the webmaterial, stored in wound-up roll form is placed on the rollers 10 and11. Thereafter the web material can be unwound by rotating the pulley 18clockwise by means of the cord 22, the gear 16 by means of the shaft 17joining in the resulting movement, so that also the gears 15 rotate. Inthe movement of the gears 15 the rollers 10 and 11 take part and aretherefore rotating counterclockwise. By contact between the rollers andthe web material the screen roll is rotating and its outer layers aresuccessively unwound, whereby the web is lowered between the rollers.When approximately one layer of the screen roll is left, the unwindingmovement is interrupted, so that the web material is tained by means offriction between the hook of the weight and the cord, so that the webmaterial cannot be unwound by its own weight.

As is evident from the above, a device is provided by the invention inwhich a screen roll can be placed in rotatable mounting merely by simplyplacing the same on the two rollers, and in which arrangement the screenroll only in case it is made of very soft material does require anycore, which in any case then can be of a very of driving said rollers atthe same speed in both directions, said web having a portion extendingbetween and frictionally engaging said rollers for being unwound andwound by said rollers with the free end of said web portion hanging downbetween and from said rollers. 2. Background screen according to claim1, characterized by said rollers at each end being journalled oncircular discs which at their center are pivotably mounted on supportsand means for fixing said discs relative to said supports in twopositions differing 90 depending on whether said supports are fixed to awall or a ceiling whereby said rollers are placed in a horizontal plane.

1. A background screen device attachable to a wall or a ceilingcomprising a rolled web for forming the background screen, two rotatablymounted and interspaced rollers whose longitudinal axises are paralleland positioned in the same horizontal plane, a rollers gear transmissionconnected to said rollers and capable of driving said rollers at thesame speed in both directions, said web having a portion extendingbetween and frictionally engaging said rollers for being unwound andwound by said rollers with the free end of said web portion hanging downbetween and from said rollers.
 2. Background screen according to claim1, characterized by said rollers at each end being journalled oncircular discs which at their center are pivotably mounted on supportsand means for fixing said discs relative to said supports in twopositions differing 90* depending on whether said supports are fixed toa wall or a ceiling whereby said rollers are placed in a horizontalplane.